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1. REPORT NUMBER 

 TP 82-3 



2. GOVT ACCESSION NO. 



3. RECIPIENT'S CATALOG NUMBER 



4. TITLE (-and Subtitle; 



RIPRAP STABILITY SCALE EFFECTS 



TYPE OF REPORT & PERIOD COVERED 



Technical Report 



6. PERFORMING ORG. REPORT NUMBER 



7. AUTHORfo; 



Laurie L. Broderick 

 John P. Ahrens 



8. CONTRACT OR GRANT NUMBERfsJ 



. PERFORMING ORGANIZATION NAME AND ADDRESS 



Department of the Army 



Coastal Engineering Research Center (CERRE-CS) 



Fort Belvoir, Virginia 22060 



D31680 



11. CONTROLLING OFFICE NAME AND ADDRESS 



Department of the Army 



Coastal Engineering Research Center 



Kingman Building, Fort Belvoir. Virginia 22060 



. REPORT DATE 



August 1982 



. NUMBER OF PAGES 



29 



14. MONITORING AGENCY NAME & ADDRESSfy/ d/«oren( from Controlling Olllce) 



15. SECURITY CLASS, (ol Ihit report) 



UNCLASSIFIED 



16. DISTRIBUTION STATEMENT (ol this Report) 



Approved for public release; distribution unlimited, 



17. DISTRIBUTION STATEMENT (ol the ebetract entered In Block 20, It ditlerent Irom Report) 



18. SUPPLEMENTARY NOTES 



19. KEY WORDS (Co 



saary and Identlly by block i 



Riprap stability 

 Small scale 

 Prototype scale 



Waves 



Scale effects 



20. ABSTT^ACT (TToirtfaiie ea rmvermm aix^ ft rmi^e^aary and IderUlty by block number) 



This report is based on small-scale tests of riprap stability at a 1:10 

 (model: prototype) Froude scale, which replicate previous tests conducted in 

 the large wave tank at the Coastal Engineering Research Center (CERC) . The 

 large wave tank tests used wave heights which exceeded 5 feet in some instances 

 and can be regarded as prototype scale. Scale effects were approximately 20 

 percent at the zero-damage level, and the small-scale tests gave more 

 conservative estimates of zero-damage wave heights and wave runups than those 

 (continued^ 



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